Specification:Model: MD918Moisture Measurement Range: 4%~80% RHAccuracy: 0.5%Power Supply: 3*1.5V AAA Alkaline Batteries (NOT included)Color: BlueSize (L*W): 13*6.8cm / 5.12*2.68inWeight: Approx. 170g/6.0oz Features:1. Measurement through HF electromagnetic waves sensing.2. Wide measurement range from 4% to 80% RH and high accuracy of 0.5%.3. Provide 10 grades of wood material density for various wood measurement.4. Support upper limit setting and overrunning indication.5. Digital LCD Screen: For clear humidity display.6. Automatic compensation for environmental temperature.7. Suitable for measuring water content of bamboo or wood products, cotton, paper, herbal medicines, etc.